Improvement in hydrants



UNITED STATESl PATENT OEETCE.

MARSHALL BURNETT, OF HYDE PARK, MASSACHUSETTS.

IMPROVEMENT IN HVDRANTS.

Specification forming part of Letters Patent No. 158,622, dated January 1'2, 1875; application led December 9,1874.

To all 'whom it 'may concern:

Be it known that I, MARSHALL BURNETT, of Hyde Park, in the county of Norfolk and State of VMassachusetts, have invented a new and useful Improvement in Hydrants 5 and do hereby declare the same to be fully described in the following specification and represented in the accompanyingdrawings, of which- Figure 1 is a sid'e elevation, and Fig. 2 a vertical and transverse section, of a hydrant havin g my improvement.

In carrying out my invention I provide the valve of a hydrant with an auxiliary or smaller valve, and a seat therefor, the said auxiliary va-lve to be fastened to the valve-stein 5 and I also make the main valve with one or more passages extending` through it from the seat of the auxiliary valve, and I apply the main valve to the stein of both valves, so as to be capable of sliding thereon a short distance from the auxiliary valve up to a shoulder on the stem, or to the cross-head or guide of such stein, the object of Asuch being to relieve the ina-in valve of pressure of water to an important extent, tending to prevent it from being readily opened.

It is well known that, owing to the great head of water against the valve of a streetliydrant, it often becomes a difficult matter to force the valve open or away from its seat.

VVth uiy invention the valve can be easily opened, the auxiliary valve being rst opened larly in what is termed the Lowry hydrant.77

The said screw engages with or screws into the stein E of the inain valve F, applied to a seat, G, at the lower end of the body A. A cross'head or guide, a, projecting from the stein in opposite directions, ent-ers vertical grooves b b in the body A, and serves to hold the stem from revolving, and also to guide it rectilinearly in its vertical motions. O11 the lower part of the stem E, and below the main valve F, is the smaller or auxiliary valve H, it being fastened to the stein at a distance from the cross-liead greater than the depth or thickness of the main valve, the same being in order that the main valve (which should slide freely on the stein) may move away from the auxiliary valvea short distance, and up against the cross-head or a shoulder formed on the stem. The main valve has on its lower surface or part a seat, cl, for the auxiliary valve, there being' from such seat one or more holes, c, made up through the inain valve.

Fig. 3 represents a top view of the main valve with itsv inducts or holes e.

On turning the key to open the main valve the auxiliary valve will first be moved down away from the main valve, whereby water will rush through the inducts of the main valve and into and iill the body ofthe hydrant. On continuing to depress the valve-stein the crosshead a will be forced down against the main' valve, and the latter, as the cross-head may openings, e, and arranged to slide on the said valve-stein froin the auxiliary valve to a shoulder or cross-head, a, in the stem, all being substantially as specified.

MARSHALL BURNETT.

Witnesses:

R. H. EDDY, J. It. SNow.A 

